flake.nix

{
  description = "steps";

  inputs = {
    flake-parts.url = "github:hercules-ci/flake-parts";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
  };

  outputs =
    inputs@{ flake-parts, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      imports = [
        # To import a flake module
        # 1. Add foo to inputs
        # 2. Add foo as a parameter to the outputs function
        # 3. Add here: foo.flakeModule

      ];
      systems = [
        "x86_64-linux"
        "aarch64-linux"
        "aarch64-darwin"
        "x86_64-darwin"
      ];
      perSystem =
        {
          config,
          self',
          inputs',
          pkgs,
          system,
          ...
        }:
        let
          jre = pkgs.jdk17;
          withJRE = jre: pkg: (pkg.override { inherit jre; });
          scala-tools = builtins.map (withJRE jre) (
            with pkgs;
            [
              scala-cli
              metals
              scalafmt
              sbt
            ]
          );
        in
        {
          # Per-system attributes can be defined here. The self' and inputs'
          # module parameters provide easy access to attributes of the same
          # system.

          # Equivalent to  inputs'.nixpkgs.legacyPackages.hello;
          # packages.default = pkgs.hello;
          devShells.default = pkgs.mkShell {
            buildInputs = [ jre ] ++ scala-tools;
          };
        };
      flake = {
        # The usual flake attributes can be defined here, including system-
        # agnostic ones like nixosModule and system-enumerating ones, although
        # those are more easily expressed in perSystem.

      };
    };
}